[dev.link] cmd/internal/goobj2, cmd/link: avoid some repeated offset calculations

[dev.link] cmd/internal/goobj2, cmd/link: avoid some repeated offset calculations

When iterating relocations, do the offset calculation just once.
This gives some speedup:

(linking cmd/compile)
Deadcode      52.8ms ± 1%    47.6ms ± 1%  -10.01%  (p=0.008 n=5+5)
Dostkcheck    44.2ms ± 1%    41.0ms ± 1%   -7.29%  (p=0.008 n=5+5)

Change-Id: I09e38bc29afc379a81f99e3ee4ff467bc1b5f8a5
Reviewed-on: https://go-review.googlesource.com/c/go/+/222302
Reviewed-by: Than McIntosh <thanm@google.com>